#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

#define         HSS_MD5_ENCRYPTEDKEY_LEN    16
#define   HSS_MD5_RAND_LEN            5
#define         HSS_MD5_DIGEST_LEN      32

/*
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
  ((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
  ((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
*/

typedef unsigned char *POINTER;
typedef unsigned short int UINT2;
typedef unsigned int UINT4;
typedef unsigned char U8;

typedef struct {
  UINT4 state[4];
  UINT4 count[2];
  unsigned char buffer[64];
} MD5_CTX;

static unsigned char PADDING[64] = {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

// 定义F G H I 为四个基数

#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
  }

int UEMD5Authorize(U8 *K, U8 *RAND, U8 *RES);
//void GenMD5AuthVectors(U8 *EncryptedKey, HssAuthVec *pVector, U8 iVecNum);
void MD5Init(MD5_CTX   *context);
void MD5Update(MD5_CTX *context,unsigned char *input,unsigned int inputLen);
void MD5Final(unsigned   char   digest[16],   MD5_CTX   *context);
static void MD5Transform   (  unsigned int   state[4],unsigned   char   block[64]);
static void Encode   (unsigned   char   *output,  unsigned int   *input,unsigned   int   len);
static void Decode   (  unsigned int   *output,unsigned   char   *input,unsigned   int   len) ;
static void MD5_memcpy   (POINTER output, POINTER input,unsigned   int   len)  ;
static void MD5_memset   (POINTER output,int   value,unsigned   int   len) ;
char* MDString(char *string, unsigned int len)  ;
//String MDFile   (String filename);
char* hmac_md5(char*   text,char*     key);


int GenMD5Rand(U8 *val)
{
        unsigned int n;
        U8 *p = val;

        n = rand();
        *p ++ = n & 0xff;
        *p ++ = (n >> 8) & 0xff;

        n = rand();
        *p ++ = n & 0xff;
        *p ++ = (n >> 8) & 0xff;
       return 0;
}

void ConvertDigitStrToBin(U8 *Str, U8 *Bin, U8 len)
{
    char ch0, ch1;
       U8        i0, i1, i, nlen;

    memset(Bin, 0, len);
       nlen = strlen((char*)Str) / 2;
       if(nlen >= len)
        nlen = len;
       for(i=0; i<nlen; i++)
    {
               ch0 = Str[2*i];
               ch1 = Str[2*i + 1];
        i0 = i1 = 0;
               if(ch0 <= '9' && ch0 >= '0')
            i0 = ch0 - '0';

               if(ch1 <= '9' && ch1 >= '0')
            i1 = ch1 - '0';
               Bin[i] = (i0 & 0x0F) << 4 | (i1 & 0x0F);
    }
}

//Used by UE
int UEMD5Authorize(U8 *K, U8 *RAND, U8 *RES)
{
        char*   pszminwen = NULL;
        unsigned char           buff[4096], rand[HSS_MD5_RAND_LEN];
        //int iRand;
        unsigned int            md5StringLength = HSS_MD5_RAND_LEN + HSS_MD5_ENCRYPTEDKEY_LEN;

        memset(buff, 0, 4096);

        //iRand = atoi(RAND);
    ConvertDigitStrToBin(RAND, rand, HSS_MD5_RAND_LEN*2);

        memset(buff, 0, 4096);
        memcpy((char *)buff, rand, HSS_MD5_RAND_LEN);
        memcpy(&(buff[HSS_MD5_RAND_LEN]), (char *)K, HSS_MD5_DIGEST_LEN );

        pszminwen = MDString((char *)buff, md5StringLength);
        if(NULL != pszminwen)
        {
                memcpy(RES, pszminwen, HSS_MD5_DIGEST_LEN);
        }
        RES[strlen(pszminwen)] = 0;

        return 0;
}

//Used by HSS
#if 0
void GenMD5AuthVectors(U8 *EncryptedKey, HssAuthVec *pVector, U8 iVecNum)
{
        u_char          buff[4096];
        char*           pszminwen = NULL;
    int                 i;
        unsigned int            md5StringLength = HSS_MD5_RAND_LEN + HSS_MD5_ENCRYPTEDKEY_LEN;

        ekLength = strlen((char *)EncryptedKey);

        srand(time(0));
    /* Generate auth vectors */
    for(i = 0; i < iVecNum; i++)
    {
        memset((char*)&(pVector[i]), 0, sizeof(HssAuthVec));
        /* RAND */
        GenMD5Rand(pVector[i].sRAND);
        //GenRand(pVector[i].sRAND);
         HssLogBin("rand:", pVector[i].sRAND, HSS_MD5_RAND_LEN);
      //  PrintBinCode("Generate RAND Bin: ", pVector[i].sRAND, AU_MAX_RAND_LEN);
                //randLength = sizeof(int);  //is the fixed length, and not strlen((const char *)pVector[i].sRAND);

                memset(buff, 0, 4096);
                memcpy((char *)buff, (char *)pVector[i].sRAND, HSS_MD5_RAND_LEN);
                memcpy(&buff[HSS_MD5_RAND_LEN], (char *)EncryptedKey, HSS_MD5_ENCRYPTEDKEY_LEN );
                hss_log("  the length of md5 string: %d", md5StringLength);
                HssLogBin("buff:", buff, md5StringLength);

                pszminwen = MDString((char *)buff, md5StringLength);

                if(NULL != pszminwen)
                {
                        memcpy((unsigned char *)pVector[i].sXRES,pszminwen,HSS_MD5_DIGEST_LEN);
                }
        //PrintBinCode("Generate XRES Bin: ", pVector[i].sXRES, AU_MAX_XRES_LEN);
    }
    //IncIND(psSQN);
}
#endif

//开始进行MD5计算
void MD5Init (MD5_CTX *context)
{
  context->count[0] = context->count[1] = 0;
  // 在这里定义四个常数，也就是我们刚才讲到的四个特征数.

  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}

void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)
{
  unsigned int i, index, partLen;

  index = (unsigned int)((context->count[0] >> 3) & 0x3F);

  if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))
context->count[1]++;
  context->count[1] += ((UINT4)inputLen >> 29);

  partLen = 64 - index;

  if (inputLen >= partLen) {
MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
MD5Transform (context->state, context->buffer);

for (i = partLen; i + 63 < inputLen; i += 64)
  MD5Transform (context->state, &input[i]);

index = 0;
  }
  else
i = 0;

  MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)&input[i],
  inputLen-i);
}

void MD5Final (unsigned char digest[16], MD5_CTX *context)
{
  unsigned char bits[8];
  unsigned int index, padLen;

  Encode (bits, context->count, 8);

  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  MD5Update (context, PADDING, padLen);
  MD5Update (context, bits, 8);

  Encode (digest, context->state, 16);
  MD5_memset ((POINTER)context, 0, sizeof (*context));
}

static void MD5Transform (UINT4 state[4],unsigned char block[64])
{
  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

  Decode (x, block, 64);

  /* 第一轮循环 */
  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

/* 第二轮循环 */
  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

  /* 第三轮循环 */
  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

  /* 第四轮循环 */
  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;

  MD5_memset ((POINTER)x, 0, sizeof (x));

}
static void Encode (unsigned char *output,UINT4 *input,unsigned int len)
{
  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (unsigned char)(input[i] & 0xff);
output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
  }
}

static void Decode (UINT4 *output,unsigned char *input,unsigned int len)
{
  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
  (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}

static void MD5_memcpy (POINTER output,POINTER input,unsigned int len)
{
  unsigned int i;

  for (i = 0; i < len; i++) output[i] = input[i];
}

static void MD5_memset (POINTER output,int value,unsigned int len)
{
  unsigned int i;

  for (i = 0; i < len; i++)
((char *)output)[i] = (char)value;
}

  /*   Digests   a   string   and   prints   the   result.   */
  char* MDString(char *string, unsigned int len)
  {
      MD5_CTX   context;
      unsigned   char   digest[16];
      //char   output1[33];
      static     char   output[33]={"\0"};
     // int   len   =   strlen(string);
      int   i;
      MD5Init   (&context);
      MD5Update   (&context,   (unsigned   char*)string,   len);
      MD5Final   (digest,   &context);


      for   (i   =   0;   i   <   16;   i++)
      {
      sprintf(&(output[2*i]),"%02X",(unsigned   char)digest[i]);
      }

      return   (char *)output;
  }
char* hmac_md5(char*   text,char*     key)
  {
                  char       digest[16];
                  char       output1[32];
                  static   char   output[33]={"\0"};
                  MD5_CTX   context;
                  unsigned   char   k_ipad[65];         /*   inner   padding   -
                                                                              *   key   XORd   with   ipad
                                                                              */
                  unsigned   char   k_opad[65];         /*   outer   padding   -
                                                                              *   key   XORd   with   opad
                                                                              */
                  unsigned   char   tk[16];
                  int   i;
                  int   text_len   =   strlen   (text);
                  int   key_len=strlen(key);
                  /*   if   key   is   longer   than   64   bytes   reset   it   to   key=MD5(key)   */
                  if   (key_len   >   64)
  {
                                  MD5_CTX             tctx;

                                  MD5Init(&tctx);
                                  MD5Update(&tctx,(unsigned   char*)   key,   key_len);
                                  MD5Final(tk,   &tctx);

                                  key   =   (char*)tk;
                                  key_len   =   16;
                  }

                  /*
                    *   the   HMAC_MD5   transform   looks   like:
                    *
                    *   MD5(K   XOR   opad,   MD5(K   XOR   ipad,   text))
                    *
                    *   where   K   is   an   n   byte   key
                    *   ipad   is   the   byte   0x36   repeated   64   times
                    *   opad   is   the   byte   0x5c   repeated   64   times
                    *   and   text   is   the   data   being   protected
                    */

                  /*   start   out   by   storing   key   in   pads   */

                  /*bzero(   k_ipad,   sizeof   k_ipad);
                      bzero(   k_opad,   sizeof   k_opad);
                  */

                  for(i=0;i<65;i++)
                  k_ipad[i]=(unsigned   char)0;
                  for(i=0;i<65;i++)
          k_opad[i]=(unsigned   char)0;

                  /*bcopy(   key,   k_ipad,   key_len);
                      bcopy(   key,   k_opad,   key_len);
                    */
                    for(i=0;i<key_len;i++)
                    {
  k_ipad[i]=(unsigned   char)key[i];
  k_opad[i]=(unsigned   char)key[i];
                    }

                  /*   XOR   key   with   ipad   and   opad   values   */
                  for   (i=0;   i<64;   i++)
  {
                                  k_ipad[i]   ^=   0x36;
                                  k_opad[i]   ^=   0x5c;
                  }
                  /*
                    *   perform   inner   MD5
                    */
                  MD5Init(&context);                                       /*   init   context   for   1st
                                                                                              *   pass   */
                  MD5Update(&context,   k_ipad,   64);             /*   start   with   inner   pad   */
                  MD5Update(&context,   (unsigned   char*)text,   text_len);   /*   then   text   of   datagram

  */
                  MD5Final((unsigned   char*)digest,   &context);                     /*   finish   up   1st   pass   */
                  /*
                    *   perform   outer   MD5
                    */
                  MD5Init(&context);                                       /*   init   context   for   2nd
                                                                                              *   pass   */
                  MD5Update(&context,   k_opad,   64);           /*   start   with   outer   pad   */
                  MD5Update(&context,(unsigned   char*)   digest,   16);           /*   then   results   of   1st
                                                                                              *   hash   */
                  MD5Final((unsigned   char*)digest,   &context);                     /*   finish   up   2nd   pass   */
                  for   (i   =   0;   i   <   16;   i++)
                  {
  sprintf(&(output1[2*i]),"%02x",(unsigned   char)digest[i]);
  sprintf(&(output1[2*i+1]),"%02x",(unsigned   char)(digest[i]<<4));
                  }
                  for(i=0;i<32;i++)
  output[i]=output1[i];
                  return   output;
  }

#if 0
#endif
/*
int main(int argc, char *argv[])
{
    unsigned char *str;
    unsigned char               buff[4096], key[32], res[32], rand[5];
    char *ss = "ims0100010000000";
    int i, iRand;

    memset(buff, 0, 4096);

    ConvertDigitStrToBin(argv[1], rand, 10);
    memcpy(buff, rand, 5);

    memcpy(buff+5, argv[2], 16);

    printf("\nRAND:\n\t");
    for(i=0; i<5; i++)
        printf("%02x", rand[i]);

    printf("\nKEY:\n\t");
    for(i=0; i<16; i++)
        printf("%02x", argv[2][i]);

    str = MDString(buff, 21);
    printf("\nOuput RES: %s.\n", str);

    UEMD5Authorize(argv[2], argv[1], res);
    printf("Calc by UEMD5Authorize: %s.\n", res);

    for(i=0; i<16; i++)
        printf("%02x", ss[i]);
    getchar();
        return 0;
}
*/
